Add 42/21 and 36/40
1st number: 2 0/21, 2nd number: 36/40
42/21 + 36/40 is 29/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 21 × 40 = 840,
42/21 = 42 × 40/21 × 40 = 1680/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
36/40 = 36 × 21/40 × 21 = 756/840 - Add the two like fractions:
1680/840 + 756/840 = 1680 + 756/840 = 2436/840 - 2436/840 simplified gives 29/10
- So, 42/21 + 36/40 = 29/10
In mixed form: 29/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+36/40 42/21+72/40 42/21+36/80 42/63+36/40